Advanced MEMS microphone clips on to sound hole Preamp/DSP unit Dramatically improves your live acoustic sound 1/4" AUX input with volume for piezo, magnetic pickups or other onboard electronics 1/4" Output with level control for amplifier or PA system USB audio out for recording on a computer or mobile device Cancel Feedback with multiple frequency feedback cancelling 6 tone presets Personal instrument calibration Works on any acoustic, acoustic electric or ukulele with round sound hole Phase switch for optimizing dual source sound